[C:1]1([C:6]([C:8]2[CH:18]=[CH:17][C:11]([CH:12]([CH3:16])[C:13]([OH:15])=[O:14])=[CH:10][CH:9]=2)=[O:7])[S:5][CH:4]=[CH:3][CH:2]=1.[Na].[CH3:20]N(C)P(N(C)C)(N(C)C)=O.CI>O>[C:1]1([C:6]([C:8]2[CH:18]=[CH:17][C:11]([CH:12]([CH3:16])[C:13]([O:15][CH3:20])=[O:14])=[CH:10][CH:9]=2)=[O:7])[S:5][CH:4]=[CH:3][CH:2]=1To a stirred mixture of 28.2 parts of p-(2-thenoyl)hydratropic acid, sodium salt and 250 parts of hexamethylphosphoramide are added 56.8 parts of methyl iodide at room temperature (slightly exothermic reaction). The whole is stirred at room temperature for one hour. The reaction mixture is poured onto 1000 parts of water and the product is extracted three times with 140 parts of diisopropylether. The combined extracts are washed with 200 parts of water, dried, filtered and evaporated. The residue is crystallized from 35 parts of diisopropylether at 0° C, washed with cooled ether and dried, yielding methyl p-(2-thenoyl)hydratropate; mp. 62° C.
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